In general, overused reaction pics or comments like "I are12 and like m'tallica" do only contribute to highlight the low mental capabilities of the writer; they are not a big problem. Nonetheless, it is annoying when they get a massive amount of upvotes and therefore hinder other great comments.

I'm a swimmer and know tons of guys who are lifeguards and I swear all they ever do is sit around. They even joke about it when they tell me about it. It's just hours and hours of sitting around watching kids have fun while you get skin cancer sun burn.